Every correction has a price, every battle has scars, and every person whose destiny has been rewritten must face "the self he should have been."
Fierce battles run throughout the book - Naruto crushes as a reborn and coexists with the weak defeating the strong, and every awakening is an explosion driven by emotions. But what is more scorching than the battle is a person who has reached the end of the road and learned to give his complete self despite limitations.
The end of reincarnation is not death or eternal life, but learning to give your complete self in the midst of limitation.